提交表单时的等待(loading)效果

$(document).ready(function () {
$("body").prepend('<div ); // loading.
});

点击提交表单的按钮:

$(".search-box button[type='submit']").click(function () {
        Loading();
});

function Loading() {
  $("#overlay, #PleaseWait").show();
  document.getElementById('PleaseWait').innerHTML = "<img src='/Images/busy.gif'>Loading...";   // 解决在ie加载时gif图片freeze问题
  return true;
}